Interpreting fluid pressure anomalies in shallow intraplate argillaceous formations

Fluid pressure variations and prediction of shallow earthquakes.

An analytical model for hydraulic fracturing in shallow bedrock formations.

A theoretical method is proposed to estimate post-fracturing fracture size and transmissivity, and as a test of the methodology, data collected from two wells were used for verification. This method can be employed before hydrofracturing in order to obtain estimates of the potential hydraulic benefits of hydraulic fracturing. Five different pumping test analysis methods were used to evaluate th...

Modelling of Permeability Changes in Argillaceous Sandstones due to Fluid Injection

Injection of formation water can cause formation damage due to the migration of fines, clay swelling, gas bubble formation, as well as the precipitation and dissolution of minerals. Because the injected water has approximately the same chemical characteristics as the production water, fines migration and gas bubbles will be the main sources of formation damage. The near vicinity of the well wil...

Mach cone in a shallow granular fluid.

We study the V -shaped wake (Mach cone) formed by a cylindrical rod moving through a thin, vertically vibrated granular layer. The wake, analogous to a shock (hydraulic jump) in shallow water, appears for rod velocities vR greater than a critical velocity c . We measure the half angle theta; of the wake as a function of vR and layer depth h . The angle satisfies the Mach relation, sin theta=c/v...

Interpreting Blood Pressure in Younger Adults.

SEE PAGE 327 E pidemiologic studies show a strong relationship between blood pressure (BP) measurements and the incidence of major cardiovascular events (1). The primary basis for the treatment of hypertension has been the belief that reducing BP provides cardiovascular protection. This is supported by evidence from pivotal clinical trials (2–7), conducted mostly in older patients at high cardi...